A Micropower CMOS-Instrumentation Amplifier
Degrauwe, M.; Vittoz, E.; Verbauwhede, I.
Solid-State Circuits, IEEE Journal of
Volume 20, Issue 3, Jun 1985 Page(s): 805 - 807
Digital Object Identifier  
Summary:A CMOS switched capacitor instrumentation amplifier is presented. Offset is reduced by an auto-zero technique and effects due to charge injection are attenuated by a special amplifier configuration. The circuit which is realized in a 4-μm double poly process has an offset (τ) of 370 μV, an rms input referred integrated noise (0.5 -f_c/2) of 79 μV, and consumes only 21 μW (f_c = 8 kHz, V_DD = 3 V).

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